Cretaceous Research 63 (2016) 63e67 Contents lists available at ScienceDirect Cretaceous Research journal homepage: www.elsevier.com/locate/CretRes The first fossil species of subfamily Piestinae (Coleoptera: Staphylinidae) from the Lower Cretaceous of China * Yanli Yue a, Jun-Jie Gu b, , Qing Yang c, Jinmin Wang c, Dong Ren d a School of Life Science, Ningxia University, 539 West Helanshan Road, Xixia District, Yinchuan 750021, China b College of Biological Science and Engineering, Beifang University of Nationalities, 204 Wenchangbeijie, Xixia District, Yinchuan 750021, China c Ningxia Geological Museum, 301 East Street of People's Square, Jinfeng District, Ningxia 750011, China d College of Life Sciences, Capital Normal University, 105 Xisanhuanbeilu, Haidian District, Beijing 100048, China article info abstract Article history: Two new Early Cretaceous fossil rove beetle species, Paleosiagonium brevelytratum n. gen. n. sp. and Received 7 November 2015 Paleosiagonium adaequatum n. gen. n. sp. are described from the Lower Cretaceous Yixian Formation of Received in revised form Liaoning Province, China. They are clearly placed in the extant Piestinae according to the following 5 February 2016 characters: body elongate and flat; anterior coxae small and globose; abdomen long and parallel-sided, Accepted in revised form 1 March 2016 with six visible sterna and one pair of paratergites on segments IIIeVII. This is the first report on the Available online 3 March 2016 occurrence of the coleopteran subfamily Piestinae in the fossil record. The new discoveries indicate that Piestinae have originated at least by the Early Cretaceous, at about 125e120 Ma. Keywords: © Staphylinidae 2016 Elsevier Ltd. All rights reserved. Piestinae New genus and new species Lower Cretaceous China 1. Introduction (Caron et al., 2012). Adults of Piestinae are characterized by body relatively elongate and depressed; antennae inserted under shelf- Piestinae nowadays includes seven extant genera and about 109 like corners of frons; procoxae small, globose; protrochantin described species: Eupiestus Kraatz, 1859, 21 species in the eastern exposed; abdomen long and parallel-sided, with six visible sterna Palearctic and Oriental regions; Hypotelus Erichson, 1839a, 8 spe- and one or two pairs of paratergites per segment; tarsi 5e5e5. cies in the Nearctic and Neotropical regions; Parasiagonum Steel, Most species are saprophages or mycophages and they occur under 1950, one species from New Zealand; Prognathoides Steel, 1950, bark of decaying trees (Thayer, 2005). one species from Australia; Piestoneus Sharp, 1889, 5 species from Until now, three fossil genera presumably related to Piestinae the eastern Palearctic region; Piestus Gravenhorst, 1806, 49 species were reported: Abolescus Tichomirova, 1968, Kovalevia Ryvkin, 1990 from the Nearctic and Neotropical regions; and Siagonium Kirby & and Trigunda Ryvkin, 1990. Abolescus was previously assigned to Spence, 1815, 24 species in the Holarctic and Neotropical regions Piestini Erichson, 1839b before Grebennikov moved it to the Trig- (Caron et al., 2012). The subfamily is not divided into tribes. Pre- onurinae (Tikhomirova, 1968; Grebennikov and Newton, 2012). In viously, it was subdivided into various tribes, subtribes and genera. the original reference, Kovalevia Ryvkin, 1990 and Trigunda Ryvkin, Now, some of that diversity has been transferred to other staphy- 1990 were both placed in the tribe Trigonurini, which was attrib- linid subfamilies, including Osoriinae, Micropeplinae, Pseudop- uted to Piestinae (Ryvkin, 1990), but was treated as a separate sinae, Trigonurinae and Apateticinae. The seven genera included in subfamily Trigonurinae (Newton and Thayer, 1992). In a restricted the Piestinae are closely similar to members of Osoriinae, except for sense, the former tribe Trigonurini was excluded from Piestinae the fact that the former has abdominal paratergites (Newton et al., (Thayer, 2005). With removal of these three genera previously 2000). But no cladistic analysis has been presented for corrobo- assigned to Piestinae, the subfamily lacks a fossil record. The origin rating its monophyly, as well as the relationship with Osoriinae and early evolution of this staphylinid subfamily remains a mystery. Recently, two well-preserved impression fossils have been collected from the Yixian Formation (Lower Cretaceous, Aptian, ca. 125e120 Ma) at Huangbanjigou, Chaomidian Village, Shangyuan * Corresponding author. E-mail address: [email protected] (J.-J. Gu). Township, Beipiao City, Liaoning Province of north-eastern China http://dx.doi.org/10.1016/j.cretres.2016.03.001 0195-6671/© 2016 Elsevier Ltd. All rights reserved. 64 Y. Yue et al. / Cretaceous Research 63 (2016) 63e67 (Fig. 1)(Yao et al., 2014; Ding et al., 2015; Shi et al., 2015; Wang Etymology. The name of the new genus is composed of the Latin et al., 2015; Labandeira et al., 2016). They represent one new prefix paleo- and the extant genus name Siagonium, with which it genus with two new species belonging to the extant subfamily has an affinity; it is neuter in gender, like the base name. Piestinae. Here, we describe the new taxa and discuss their Diagnosis. Antennae short; tempora longer than eyes; gular sutures phylogenetic significance. very narrowly separated, distinctly diverging anteriorly and pos- teriorly; protibia without thick spines along outside edge; elytra 2. Material and methods short, without row of fused punctures; abdomen with elongate longitudinal median carina on abdominal sternite III, tergites e The type specimens described herein are housed in the Key III VII each with one pair of curved basolateral ridges and two Laboratory of Insect Evolution & Environmental Changes, Capital basal carinae. Normal University, Beijing, China. They were examined using an Key to the species of Paleosiagonium gen. nov. Olympus SZX16 dissecting microscope. Pencil drawings were inked 1. Head parallel-sided along most of its length, antennomeres 1 and with the Adobe Photoshop CS3 software. The specimens were 2 elongate, 1 longer than 2, mandibles smoothly sharp towards photographed dry and wet (with 70% alcohol) with a digital camera apex, with two teeth each side, the tooth near apex as the same size ……………………………………………………… attached to the Olympus SZX16 microscope. All taxonomic acts as the one near base. …………………………………………………………… established in the present work have been registered in ZooBank P. adaequatum e LSID (see below), together with the electronic publication urn:l- Head narrower in front of attachment to prothorax, antennomere e sid:zoobank.org:pub:6A79AD8A-1425-4E3C-A3DD- 1 elongate, about as long as 2 4 combined; mandibles abruptly 0EE6B624650A. tapered toward pointed apices, with two teeth on inner margin each side, the tooth near apex much smaller than the one near base.……………………………………………………P. brevelytratum 3. Systematic palaeontology Paleosiagonium adaequatum gen. et sp. nov. Order Coleoptera Linnaeus, 1758 (Fig. 2) Family Staphylinidae Latreille, 1802 (urn:lsid:zoobank.org:act:384EF897-2813-4AED-B6EA- Subfamily Piestinae Erichson, 1839b C28025ECB903) Genus Paleosiagonium gen. nov. Diagnosis. Head parallel-sided along most of its length, anten- (urn:lsid:zoobank.org:act:3909DEF7-CCAC-49DB-A09F- nomeres 1 and 2 elongate, 1 longer than 2, mandibles with two 7685E4B57673) teeth each side, the tooth near apex as the same size as the one near Type species: Paleosiagonium adaequatum sp. nov. Fig. 1. Map of the fossil locality, with the solid star indicating the fossil site (120500E, 41370N). Download English Version: https://daneshyari.com/en/article/4746659 Download Persian Version: https://daneshyari.com/article/4746659 Daneshyari.com.